The middle layer of the eye is covered by which type of epithelium?

The nictitating membrane, also known as the $Plica \text{ } semilunaris$, is a vestigial organ present in which part of the human eye?

Which of the following structures of the eye can be artificially implanted?

In humans,image formation occurs on the retina. For the brightest vision,it should form on:

The friction between the eyelids and the cornea is avoided by the secretion of

Analogy type question:
$(1)$ Photoreceptor cells : Cones : Dim light vision : ........
$(2)$ Eyeball contains transparent crystalline : Lens : : In front of the lens : .........